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A Flexible Capacitive Humidity Sensor Enabled by LIG-Anchored Synergistic GO-PEDOT:PSS-MXene Composite
Jitong Ren1, Ronghui Dan1, Yanyan Guo1
1College of Integrated Circuit Science and Engineering, Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
Materials (Basel, Switzerland)
|June 26, 2026
Summary
This study introduces a novel, low-cost flexible humidity sensor using a graphene oxide, PEDOT:PSS, and MXene composite. This advanced sensor offers ultrahigh sensitivity for wearable electronics and health monitoring applications.
Area of Science:
- Materials Science
- Nanotechnology
- Sensor Technology
Background:
- Flexible humidity sensors are crucial for personalized health monitoring and human-machine interaction.
- Current fabrication methods often involve high costs and complex vacuum processes, limiting widespread adoption.
Purpose of the Study:
- To develop a high-performance, flexible capacitive humidity sensor using a novel composite material.
- To overcome the limitations of cost and complexity in current sensor fabrication.
Main Methods:
- Fabrication of a ternary composite of graphene oxide (GO), PEDOT:PSS, and MXene (GO-PEDOT:PSS-MXene).
- Loading the composite onto a laser-induced graphene (LIG) interdigitated electrode.
- Systematic exploitation of synergistic effects within the multidimensional architecture.
Main Results:
- Achieved ultrahigh sensitivity of 18,643.02 μF/%RH across a wide relative humidity range (11%–97%).
- Demonstrated rapid response (31.7 s) and recovery (11.2 s) times for continuous monitoring.
- Observed a negative capacitive response due to moisture-induced microstructural swelling.
Conclusions:
- The vacuum-free, synergistic multidimensional architecture enables ultrahigh sensitivity in flexible humidity sensors.
- This research establishes a scalable, low-cost paradigm for future wearable electronic systems.
- The sensor is suitable for diverse monitoring scenarios, including respiratory rhythm tracking and non-contact spatial sensing.
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